View Compilation Error

0_0_18032238_29634.cpp:16:2: error: stray '\' in program
  int i,x=ksm(3,(mod-1)\n);
  ^
0_0_18032238_29634.cpp: In function 'void pwk(int)':
0_0_18032238_29634.cpp:16:24: error: expected ')' before 'n'
  int i,x=ksm(3,(mod-1)\n);
                        ^